Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996csc..rept.....a&link_type=abstract
Technical Report, Computer Sciences Corp. Calverton, MD United States
Computer Science
S Stars, Red Giant Stars, Iue, Mass Transfer, Contamination, Binary Data, Giant Stars, Hypotheses, Main Sequence Stars
Scientific paper
Recently, we discovered with International Ultraviolet Explorer (IUE) an F0-F2 IV-V companion to the Tc-deficient S star HD 191589. If the magnitude difference is (delta)V=3.7, as indicated by several arguments, and E(B-V) = 0.0, we obtain a value of Mv= - 1.5 +/- 0.4 for the Peculiar Red Giant (PRG), too faint for it to be a thermally-pulsing asymptotic giant branch star. According to the binary mass-transfer hypothesis for Tc-deficient PRG's, a white dwarf must be the source of the s-process enhancement of the current primary star, but it cannot be seen because of the presence of the secondary. If such is the case, the F-star companion may also have been contaminated by s-process material. High-dispersion IUE observations indicate an enhancement of Zr II in the photosphere of the F-star as well. Thus, HD 191589 is likely a triple system, where what was once the most massive component of the system has polluted both of its companions with s-process material. One of these is the current S star, while the other is the companion still near the main sequence.
Ake Thomas B.
Johnson Hollis R.
Jorissen Alain
Wahlgren Glenn Michael
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